A study of the temperature-dependent
solvation dynamics of coumarin-480 in [bmim][BF4]/Triton X-100/cyclohexane
microemulsions at three different temperatures (299 K, 308 K and 317 K) is
reported. The solvation dynamics of a room temperature ionic liquid in
microemulsions becomes faster with increase in temperature. Dynamic light
scattering measurements indicate a significant change in size with temperature
for microemulsion systems with the hydrodynamic diameter decreasing with
increase in temperature. Time-resolved fluorescence anisotropy studies reveal a
decrease in the rotational restriction on the probe with increasing
temperature. Wobbling-in-cone analysis of the anisotropy data also supports
this finding.